Chemical elements
  Manganese
    Isotopes
    Energy
    Production
    Application
    Chemical properties
    Physical properties
    PDB 117e-1cs0
    PDB 1cvn-1fbg
    PDB 1fe1-1gz9
    PDB 1gzc-1j53
    PDB 1j54-1kx3
    PDB 1kx4-1mav
    PDB 1mb0-1nvm
    PDB 1nxd-1pj2
    PDB 1pj3-1r8b
    PDB 1r8c-1tc2
    PDB 1tei-1vby
    PDB 1vew-1xid
    PDB 1xie-1za0
    PDB 1zao-2ah9
    PDB 2akw-2brl
    PDB 2bvl-2dvb
    PDB 2dvd-2g38
    PDB 2g4i-2ify
    PDB 2iie-2mnr
    PDB 2muc-2p9a
    PDB 2pal-2r21
    PDB 2r22-2vqr
    PDB 2vs3-2z87
    PDB 2zad-3bso
    PDB 3bu0-3e7b
    PDB 3e8q-3g82
    PDB 3gbc-3ilm
    PDB 3ioi-3lp0
    PDB 3lp1-3n25
    PDB 3n37-3pvb
    PDB 3py5-3tmy
    PDB 3twz-4e5f
    PDB 4e5g-8icv
    PDB 8icw-9xim

Chemical properties of Manganese





Chemical properties

Manganese is more electropositive than its neighbours in the periodic table, but despite this manganese react with air at room temperature very slowly. Heated manganese powder can react with oxygen and nitrogen from the air with subsequent formation of manganese oxides with different oxidation state, mainly Mn3O4 and MnO2 and manganese nitride Mn3N2. At room temperature very slowly reacts with water:

Mn + 2H2O -> Mn(OH)2 + H2

Manganese easily reacts with common acids, like sulphuric acid or hydrochloric acid with formation of Mn2+ ions. Mn2+ ions in aqueous solution are presents as a aquated colourless complexes [Mn(OH2)62+

Liquid Manganese can produce carbides (Mn3C), electrically conductive silicides (Mn3Si), different borides (for example Mn4B), phosphides (for example Manganese monophosphide MnP).

Manganese oxidation states are +2, +3, +4, +6 and +7 (+1 and +5 very unusual) and therefore manganese can formate following oxides: MnO, Mn2O3, MnO2, MnO3 and Mn2O7. MnO3 was newer separated. Mn2O7 is a very aggressive liquid, which is unstable at high temperatures and can explode.

Another very important manganese compounds is manganate - compounds that contains the tetrahedral manganate ion MnO42-. MnO42- ion is paramagnetic. Also magnesium (Mn7+) can form Permanganates, a strong oxidizing agents.

Basic chemical reactions for manganese:

3Mn + 2O2 -(t)-> Mn3O4
3Mn + N2 -(t)-> Mn3N2
Mn + 2H2O -(t)-> Mn(OH)2 + H2
Mn + Cl2 -> MnCl2
Mn + Br2 -> MnBr2
Mn + I2 -> MnI2
Mn + F2 -> MnF2
2Mn + 3F2 -> 2MnF3
Mn + 2H2SO4(conc.) -> MnSO4 + SO2 + 2H2O
3Mn + 8HNO3 -> 3Mn(NO3)2 + 2NO + 4H2O



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